Anchorage for dams or other structures.



UNITED STATES l JOIIN F. JACKSON, `OF HOUGHTON, MICHIGAN, ASSIGNOR TO WISCONSIN BRIDGE da IRON CO., OF MILVAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

ANCHORAGE FOR DAMS OR OTHER STRUCTURES.

SPECIFICATION forming* part f Letters Patent N0. 738,722, dated September 8, 1903. l Application filed .Tuly 18, 1903. `Serial No. 165,225. (No model.)

To all whom it may concern.:

Beit known that'I, JOHN F. JACKSON, a citizen of the United States, residing at Houghton, in the county of Houghton and State of Michigan, have invented certain new and useful Improvements in Anchorage for Dams or other Structures, ofwhich the following is a y specification, reference being had to the accompanyiugdrawings,formingapartthereof.

The main object of this invention is to securely anchor dams, bridges, and other struc-` tures to natural rock formations Where such are found and can be utilized for the purpose.

It consistsin certain-novel features of construction and in the peculiar arrangement and y novel combinations of parts hereinafter parpointed out in the y y for its use exist.

Referring to the drawings, a. designates a natural rock formation such as is frequently found in the beds of streams or Waterways where dams, bridges, or other structures are to be located and require a secure anchorage.

h designates a channel cut in the rocktransversely to the stream or waterway and to the general direction of the strain on the struc' ture to he resisted.

c designates one of a series of holes drilled obliquely through the rock approximately in the direction of the strain on the structure and extending from the surface of the rock to and intersecting the channel b.

CZ :is a tie rod or bolt inserted through the hole c into the channel h, where it is provided with a nut c or other fastening, which may be lowered through the channel b and held in place therein by means of a rod f, as shown in Fig. 2, while the tie rod or bolt d is screwed into or otherwise secured to the nut or other fastening. The rod fmay be detached and removed when the parts of the anchorage are assembled. The upper end of the'tie rod or bolt d is attached to a member g of the dam or other structure by any suitable means-such, for example, as a nut h, threaded on said rod or bolt and bearing against a hanged plate or vwasher t', which is seated on the ends of angie-irons j, riveted to the member g, as shown in Fig. l. Any number of these tie-rods, according to the size or Width of the dam or other structure, may be used, and the screwthreaded fastenings at their upper ends afford means of properly adjusting the tension on the several rods and parts of the dam Or other structure to which they are attached. In connection with the tie rods or bolts d when they are arranged at an angle to the members of the dam or structureto which they are-attached, as shownin Fig. l, auxiliary anchor rods or bolts 7c maybe employed.

These auxiliary rods or bolts are secured at n a position as will resistany tendency of the lower part of the dam or other structure to heave upward when subjected to strain.

When this anchorage is applied to a dam, as shown, and the natural rock formation is porous or ssured, the channel b is filled with cement, concrete, or any other suitable substance which will form a barrier to the passage of water through the rock underneath the dam. The lower part of the dam or the members thereof to which the tie-'rods are attached is embedded in a concrete l, as shown in Fig. l.

For some structures in place of a continuous channel h separate holes or passages may be formed in the rock to intersect the holes or passages c and afford access tothe lower ends of the tie rods or bolts el for the purpose of attaching the nuts or fastenings e thereto.

Various other` changes in minor details of construction and arrangement of parts,which will be apparent to engineers or persons skilled in the art to which this invention pertains, may be made to adapt theanchorage to different structures and conditions with- IOC) out materially :affecting its principle or departing from the spirit and intended scope of my invention.

I claiml 1. An anchorage for dams and other structures consisting of a' rock foundation having passages formed therein and intersecting each other below the surface, a tie-rod extending through one passage and secured at one end .to the structure to be anchored, and a fastening attached to the other end of said rod in the other intersecting passage, substantially as described.

2. An anchorage for dams and other structures consisting of a rock foundation having holes and' an intersecting channel formed therein and extending from their intersection upwardlyin diverging lines to the surface of the rock, tie-rods inserted in said holes and secured at the lower ends in the intersecting channel and at their upper ends to the structure to be anchored, substantially as described.

3. An anchorage for dams and other structures consisting of a natural rock formation having holes and an intersecting channel formed therein and extending upwardly from their intersection through the'surface of the rock, tie-rods passing from the structure to which they are secured downwardly through said holes into said channel where they are provided with fastenings for holding them therein, said fchannelbeing filled with a substance which forms a barrier to the passage of water, substantially as described.

.4.. An'anchorage for dams and other structures consisting of a natural rock formation Ihaving a channel formed therein transverse to the strain on the structure to be resisted, and holes intersecting said channel and arranged approximately in the line of such strain, tie-rods fastened at one end to the structure and passing through said holes into said channel, and fastenings securing the other ends of said rods in said channel, substantially as described.

5. An anchorage for dams and other structures consisting of a natural rock formation having intersecting holes or passages formed thereinand opening through its surface, and tie-rods each secured at one end to the dam or otherstructure and extending downwardly therefrom in the general direction of the strain to be resisted through one of said passages and provided in the intersecting passage with a fastening adapted to hold it securely in place, the lower part of the dam or other structure being'embedded in concrete, substantially as described.

In witness whereof I hereto affix my signature in presence of -two witnesses.

JOHN F. JACKSON. 

